Helicopter



FIG. 1 is a right side elevational view of a helicopter showing my newdesign with the forward rotor blade broken away in the center forconvenience of illustration it being understood that said forward rotorblade is of the same length as the rear upper rotor blade;

FIG. 2 is a top plan view thereof;

FIG. 3 is an enlarged front elevational view thereof with the two upperrotor blades broken away in the center for convenience of illustration;and

FIG. 4 is an enlarged rear elevational view thereof with the upper rotorblades omitted and the support structure for said blades broken away forconvenience of illustration.

The side opposite to that shown in the drawing is a mirror image thereofexcept for the tail vane and tail rotor.

The ornamental design for a helicopter, as shown and described.